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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa6858a6f2493b8d869e72e6dc559b9cccd53491cbb16cfc66b0d5bf9961cad' 
  AND token = '07TnZaccubRVYyQBZThXiXKOzPAKOULds08lbY5KYHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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