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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f63bca84d97fc36ba59e1d8a0bba2544ba9a6a38d4d468ff081b1ef01fc72f' 
  AND token = '24OYbNSWaGpEcuh3mQnbrg8VDMOG3cOaMkqKug/8Otg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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