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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a906efbd94de16433e978b614a8a9ca61cc913ba1cce069ddef1472de7e5f1' 
  AND token = '8YilpZr+PUAWsUE6fCj6ltBzFA/j4r2k7Yaxf+Sw46U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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