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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51935b98af60f6b997b015399cd18d2330e67716f6596d66e9dbcf2bcb7078f' 
  AND token = 'DtDeHlE4BMwKpe7Xx5sTm8MtuI51avK2ExY6/HOfZRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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