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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42c4b99af15f735a6739820e6c12d8f7f1164a99265d73f528b62e033494772' 
  AND token = 'vRdi42xQDRRwUd3psuVmwHbhHh6xHu2Kgxfa8i8fzDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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