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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692425651ecde1b81c8c3132b4c669ab08ae42f2965a15b6ac1d99783d70f560' 
  AND token = 'lRSlKSHSeIq9gXGMdtsKHLreBWGMj2KQ+HDi5NOwX1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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