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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0e9e3adad2a68d65ce97d8cbf692ca1be6778c51c01129dc2ef8ffd586b4cb' 
  AND token = '36+B+qy5hDhSO70DqaXHUwitYHQ0SwUwbyBqqArSR2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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