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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fc271642a8d32590867a87c705053a4c2af4b31b63ca45a3ef77e803a35b68' 
  AND token = '8JjeHDTZYjAhteBfISxZE7eMjzII0p7BXAd9kovAkWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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