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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989af8987408520c16f4a17acfa45887a4b3ac2124e34c11158efe560b360cf5' 
  AND token = '/xNW6wJd5rKl/6eEv/qj8Vq3DR9+E8SC+7xGG8SjL3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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