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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f39aac7df21942c7a06071a8a4443efbeb1a62fb7ab5318ea6bcd7176ec851' 
  AND token = 'eiJ14C9uE9EqzwPThqDnjNBi79ljhMfFAKP0lgAb6bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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