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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83fcf5dcb7340fb215d7cb16c9cac92eb9f5a1582078fa6aaf7a516f3c4b521' 
  AND token = '3VjBElSBr9JBjjZkVZo5bZSIflTyIzQHUFJDTq24iB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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