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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cab0832cf06e8a28fa4a4940329b8f3b7ed369137b2e858396fa0490c0a7b8b' 
  AND token = 'Eu9UZaaRLzkY8JR7xGl/dhLSVJanHyVa6vveQr6glvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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