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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1e4e8080f7b334e0c626bfaec93dc41b1ff38a54ca9f6662599d2cee2c602a' 
  AND token = 'XegGZFaT5tvhuoPIBD2ZMWTgFQvoii6F8PusQSYy7MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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