SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1c4e5b78f384b1e19470a9db271773588f3bda4c54a3da761c71ec3ae39101' 
  AND token = 'jejxQsYdQVgCr4yBUlCPPHyq4RcNlUs9YJNSh/pw+V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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