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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f08f83edd1fe43f124b9916d949480412e519a3e0d51151f3fa63c4f06e7614' 
  AND token = 'I8R8vrCFbOWdfoM/Z9HuwcIY8f812X1CMTD6ufZiTmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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