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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99dd093b1b441cafffc1b17f7200199e3ed4672006cc6a00903b0d0f528ff8ad' 
  AND token = 'S6x51qTHI96MaDTnxfpBWxlVhQONwXj9VERgGZzHci0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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