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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403359a9be50a77e7301ad6a0e0ca4e8f0a959c1465fc78f6bdad71f6f95fced' 
  AND token = '9s7sszm+JPCKESFnPhp8BJ8N7Ccoz3F9m/QRUT5o7lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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