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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fc1d9a419aad1f853344b8299d35fa81810ff7738c106353b7f4cce489eeb28' 
  AND token = 'jyCfLHxD+fCtKBndla0lHKqJ65gMfHxk42jcIOVlM1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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