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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89f0ae13c0501229d9e4b0860120298bdae88418d2d702bd6871d31d03c0ae6' 
  AND token = 'QTFKxtF6tIHdFO8HX+ok/IwaSb/KyPn/BtLpP8LzKkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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