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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6d1e1607ce6a4c9dc20d2cedd035a53fded7ab0a3c59fbe6597ea0cbb4732b' 
  AND token = 'aP7mVRu0/LRQr5gdrjf+pm/0t8/VKzQF8n5cHrKvM3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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