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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a5eab932ff9e0a48b6030bb9f9d5a367ba9e151d79036082c1718247ceac70' 
  AND token = 'Y+wN9ecrOAT5YGsjjS6SmqNmcDnQx4QVwYy19ELr3d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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