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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c5d9ee4bd87b0c28ffe5345e0a2f0bf90fb7d053d9fb87e0960fb4f07fce3a4' 
  AND token = 'scE9UCw6afUl4u0/+wdGTD5nWE//nFTPUeHvft/8cs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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