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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc764702f2e25a7077677efe2ec6c0cf8b18f7817ba9c926f3df3eabc3ce0e2' 
  AND token = 'VXHaLKVU1V/HVatqiuUVYjRWN9O7BaoyoqdQH59TWJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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