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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609942898b3e9281afd7ea9d93520b44ffc6a425e9a53d36ba0a33e355caefb2' 
  AND token = 'U9dd6gKRldcPqWAOGt9W2cchVPTNMXR41f3/ctOn8nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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