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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fbb0529d5fae7a5a3f98367640494c9cef31d774ac1607d9c76ac11a1eac56' 
  AND token = 'f5JDSD66bprGyR6jfpIHyO/2a9jA23k2id7wn263EuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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