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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6f369549011514d31d7c7ee64c6645955e4bab3b8163e45a27c5b62d270f9d' 
  AND token = '+5RCPUTesRF+ezGo5gm07k0ukzdW1Z+MJWLnGmdYN+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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