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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b3cf34d2f37ea0a426531a9c9d48b2faa338a63bdfeac930f9e35270029af5' 
  AND token = 'eyOQGgWEppy011hxLrJlNf1L37IJ9LuGyRPemRBbwkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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