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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc2a73c691c52eb21600e78fd4bb09c272d420f27a86426a92eb17101d54b06' 
  AND token = '5qAX+sntjQrtbV7yoV7XlZRnPT6w+VkjH0LRsTlZlfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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