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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31cfb18f96521a9f323ee08a1413e9f9e64beaca6c0bed6c012ffe9a10e80847' 
  AND token = 'LFm0Q4yGTWrw7Sq7CVIITaSwIIiUkIpJNCjQvzFcTMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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