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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca1e13ef3c1dfa25e3e1b647bf2a75c71ddd9cd8d0c9964d0263c4ae35fdb70' 
  AND token = '1dDDwWRQXLYqOgni/cb1y8K7OfjJ00UIvo71yPaoHkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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