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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13670c61373cb48660fb90cc7a5397d10ef1d34884cf510a3e736e5a2f783b7e' 
  AND token = 'h/oN3pZOZgWaQvKUy32FX/lGhxCAdC1qRl9e4G1EKVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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