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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893c80938f8066c59e52dd035c46d0cad5ea9766218644a7bf12bdc726e23033' 
  AND token = 'bu9a1FJe4driIqvPeX/4mBVRHB7un5H7r2WqJRw3n28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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