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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9025df6f10ac4f97fd72d5b2a53904af6f69fdfe9c790362017f31ac84393eeb' 
  AND token = 'Gu2txfsrzQX0jjE4qggIaf98ae4F1tfro8teeVMCAcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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