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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d2936088a481a9fd9b9093ab9a8d660244e2d3013534db4df840ea66a1dc10' 
  AND token = 'iC0eMWt/OYXUHfFYFGEFM963ZbpJtkvIuc33Ga4IkzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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