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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f461c0de9d003da459076c331596786a06d6f4c85920e15373a1691e166ba0a' 
  AND token = 'yWjBYkNswSNRByY1Aayh0TyndA6WA3yuM7bba6GwLwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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