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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76196517e54be7ff9f8316dbe67ceb0dd645b9c23860d61e3186e76280580e02' 
  AND token = 'ShJ3k5dF2oRKOOHrTxNPxTnjc+C3I6Le222FX+Zt5tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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