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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fba1eca1f6778ba369abb32e641d5a10c56534796611a4493d8b53270e3ba6c' 
  AND token = 'PHNd5kAxErnMe5T2bJ2gNh8XsFHKCTFwhtZXkdYqyak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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