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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0d4ef2d50d98ac301416894ba220e1baf1ea89a72009fced269a229aa662e6' 
  AND token = '0U5mdYknt8DkJ3zC50bbuna6fn6C1B/oe7d/9JP875I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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