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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6192de76555eb78a4e1dd765b4145eefaa8a75c4373922b16fb6217b34520933' 
  AND token = '/1ELR9RAwfHsaHvRMFOXG/tcUa6Pfrf9yxXPcCx770c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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