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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec6c9ed08656df1268be79f0ce8b139620a8f7531f7bb6e8de6ac666b3a4f9c' 
  AND token = 'XJyFUJqzsipPZkl94W67rJAgjQtnImCU5NA6eHHlhyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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