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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da698174842455403767378c78ee490f950777ad27657173f6249ef3303b1c4' 
  AND token = 'Wbs2O8RGrcGIZ4Ut8mnRLCtQJjaBfJZUI8Snige9p5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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