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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b3886a6cb303badfa3653cae8213f583a4e0a2c7fad196ed14ab8d091dfd9a' 
  AND token = 'DJsZFHuOZtBB4oDjRSeN6l/ptTd+BSxF+1325j0jj3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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