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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a4b3baf060580a2c6fdc87718877ea1eab941fab485ffc6accd30fa1a91af4' 
  AND token = 'b9VUN+/gcsP9xJZ14FF/wSUaXN3+Nf4n4/a7HZwXpac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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