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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d71a326796274dde2e0fe31449e1cd497b7616c8052a3c7aa836e8a8ee2ce7c' 
  AND token = 'V+gSYO5FltPXxHkyX384uz+z6UiIfG7qQFEQkA72iek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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