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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb403b2d65c0fec1280ebe7656fb88d060a32c0a0cd586ecb5debcf0c54becec' 
  AND token = 'VcLukvrosw9Z393MD7F4SVSidyqMwaz7XmZk0xrksUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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