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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8c96796883de0f574b577f192ac8745970472d4ca7ca716eea8a3eb9aa9d73' 
  AND token = 'XpmetLZ5PY4Q87pN23nfWJh5QEguWbEpXFpb7GPC8SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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