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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418b2ff9729f7cf0ff6f8b9b464db20c28f295141ea42c3cc6c485d5ad79d0b7' 
  AND token = 'kkLNr+xYeQCbDCw7mhyTbX5N9LcwIOBVCuAj2arNFmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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