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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89d4d1588bfb33c603b9d590661a04ce80aa7d1b99f5966725d9c142f15dc1a' 
  AND token = 'A/Mscq5ZHQk9Til2RXRREW/Zm/va5S8l+eDoqThZLKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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