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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d16da9af749f246e267167bb71ef47143a776e6e1dcbb24f75b19b8914898b6' 
  AND token = 'fpRcFy381wVMClj+zV7ihesJMiFZpgDlbNRUi6J4tuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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