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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49f1d4c8a23316a3a85899ed2825bbf9638a16e3bf4f0b9ceaebc679a9d70c51' 
  AND token = 'VZx+cKvKWWVbj8Hy14UpoBz1w0tsjSDyFOCvrjrac3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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