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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7196e0441a4ca6d0300e4f5361d1c58195fd5775f82d357221fa67bd3e07bfe6' 
  AND token = '5dtPZYCXkOddb6E0BPLekrxdRNZrJul7jou/sUwKY/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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