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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a871381bd0760d9f61c8378988351402e1b72b7889bf8cf43856a5c8610ccc0' 
  AND token = '0cv9+PVb70ftEZkbh/q1XARzlm857lP0NlFuHXxg+zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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