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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739ee0887f836768076a03dce2613c6230dd69d96589fe35e0fc5c79f080efaa' 
  AND token = 'AsWP2QTQffZGn7JaV7hWmVcMzubsKFbjaYawGBSVyJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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