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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e95b87d5d66fd002940e39a709562bb96dc5284d68fe6476340ade4a97926d3' 
  AND token = '3XcvuHEedZwfvlwhCQ5iFEkvKdNEqDxRAREIMJ8eoBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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