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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9cda5bb2c957ad7ea24ab04b4db699e3916e5d58815d62c5fb520e42a8ab87' 
  AND token = 'hO3AXXm/jgxT0p7zcbhCYq671ROrQXKz6dlqVEB9ml0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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