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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09593beb2c73456181e132f2d3275e01d72e5255a69d4804565a2a16abd55e9' 
  AND token = 'SDlq9fzi4JjnjGRWcghvz7jBc/uNI4dtx2FRNI8jG4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00118

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}