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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684eb65db35415fe60191fa6cde05d31fb2802b6dcf2ce6e9e616c5547886c85' 
  AND token = 'a4ItUvJtTx40SGHRfbvZ8Hp/6i4T2Ua/yuhMG6TAxTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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