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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb192af67f49a9cdbd2a94cca8ec36ff3295c542e7749d92ffa82dd46364607a' 
  AND token = 'E7jtz+c5mfJTO4EFAcdK506VcfnsLm2p4Ynk2OH6BOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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