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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbed55184e2a1c5d0be0bbb2c4a0ec24fdeeb5275352b2d36966280c855dca5' 
  AND token = '/0Wsqi0XoxqoR0Cvl0Wg4szaf2YMQPpe29Y1EwCXSAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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