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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a7efd94e367889c08c4e5f62146c4fc7514e7b0c54acf50eead5d0f1bc5ff9' 
  AND token = 'WX3uoXS90zO44V7mcSioTR/NNX9aUmPzTzslrQ2/3wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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