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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8fe7e84b2df44b7e4f8fc381f26c67b3680ef745c837f21d8cf358c03b39e8' 
  AND token = '7ztisxQJFsygFWgP6PnMOBt/L8IKk4BNiFbGbzMGC9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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