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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832e64ed59164264e30e11f91fd17c2bbe47decc4e272ee89097b0718a1e1092' 
  AND token = 'hxaMMZ4gPrqhobLxtepqMVVl2dTeScau4ilSQA8R+1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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