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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd792aa73408c47ca4d04239069c0613bfe9e3b29df580fe863a0e926b72bc1' 
  AND token = 'OIXuL3K4OMzS0EdT0/N9AJQXFbM3gH0UeQVUycANkYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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