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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca140eb7c95f0efd99e83e2baf304f5072912fc6e68911f1fe7910cda5bd3f' 
  AND token = 'x8fquwTf5ulidD3hqmsbzWJv2lfY+m3h+ID1MjchUoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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