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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06198b2ad9488af8d879450f3034d27d7519cbbf742eae40f39436753f728ae1' 
  AND token = 'k/d8PrF1/MWKU61xJQIXCO05HHqi6XMmHI3+cIyY5s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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