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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760aeb596126422e90010988a0cec1bd84af2d6dfef7c7fced4403d495f11add' 
  AND token = '58jrj3EwCzn/guPKF2tG5kmH5Xvktd/G5CgST1mz/iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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