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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0897b6a774d0ae52bd2e40f888714c7b813b017188f0a27ce65df0cfe5c5009e' 
  AND token = '4y17IjCCaylPIMTvB6hg2KrYN9P1nY9AU57A2ZXPx5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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