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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e30e9a8827343fcf4e79423a15cf2e717273c1378c4a33d9e8a2615b48307ee' 
  AND token = 'FchxtUbZS0ULi6pNTV/I9PZZMkMd2F45+RgZI1GXFPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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