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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19334d5a6e9580728df4a0e8c4ea79d1e4c6e3f7ab688e94df40e823db1c54b9' 
  AND token = '4NiumGgifqMiIBzLwSQrkd1SQgJVkx9EKilHsv1DCpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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