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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19a8c945909cf0c63ff8b99931d7976a87095a68829a3e037a1885452e2c1fe' 
  AND token = 'MIRBDcdcmpoW15Z6t12AVu/88qfOw7FjfW1GYIeYHHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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