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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e05a68866c69eea4b9a528965d29f365b7b63de1dae8aedf91a8db64a59952' 
  AND token = 'bePgZOP3D/eq81pHdJqHUnDQwPQrw0bn0hvdBpyOlqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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