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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368db2ed48f6fcd3248a8ddf4bcd007ebab556c0ab92d172cd9e2c427ff28971' 
  AND token = '+3n1ECc6ouOhF5LracojcRtyN+l3kwRp0BxdMm1qCZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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