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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d312974e5431b83a46f29aceed15721de48536f7c75ba42a7a4f43b133b8134' 
  AND token = 'C2bBYRgB/YtZyeuRWNPNB0jhXMsL69v8c1Z6ZIMHdxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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